En-4
Explanation of symbols displayed on the indoor unit or outdoor unit.
WARNING
This symbol shows that this appliance uses a
fl
ammable
refrigerant.
If the refrigerant is leaked and exposed to an external igni-
tion source, there is a risk of
fi
re.
CAUTION
This symbol shows that the operation manual should be
read carefully.
CAUTION
This symbol shows that a service personnel should be
handling this equipment with reference to the installation
manual.
CAUTION
This symbol shows that information is available such as
the operating manual or installation manual.
2. PRODUCT SPECIFICATION
2. 1. Installation tools
Tool name
Change from R22 to R32 (R410A)
Gauge manifold
Pressure is high and cannot be measured with a R22
gauge. To prevent erroneous mixing of other refrigerants,
the diameter of each port has been changed.
It is recommended to use gauge with seals -0.1 to 5.3 MPa
(-1 to 53 bar) for high pressure.
-0.1 to 3.8 MPa (-1 to 38 bar) for low pressure.
Charge hose
To increase pressure resistance, the hose material and base
size were changed. (R32/R410A)
Vacuum pump
A conventional vacuum pump can be used by installing a
vacuum pump adapter.
(Use of a vacuum pump with a series motor is prohibited.)
Gas leakage detector
Special gas leakage detector for HFC refrigerant R410A or
R32.
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of residual
oil is less than 40 mg/10 m. Do not use copper pipes having a collapsed, deformed or
discolored portion (especially on the interior surface). Otherwise, the expansion value or
capillary tube may become blocked with contaminants.
As an air conditioner using R32 (R410A) incurs pressure higher than when using R22, it is
necessary to choose adequate materials.
WARNING
• Do not use the existing (for R22) piping and
fl
are nuts.
If the existing materials are used, the pressure inside the refrigerant cycle will rise and
cause failure, injury, etc. (Use the special R32/R410A materials.)
• Use (re
fi
ll or replace with) speci
fi
ed refrigerant (R32) only. Use of unspeci
fi
ed refriger-
ant can cause product malfunction, burst, or injury.
• Do not mix any gas or impurities except speci
fi
ed refrigerant (R32). In
fl
ow of air or ap-
plication of unspeci
fi
ed material makes the internal pressure of the refrigerant cycle too
high, and may cause product malfunction, burst of piping, or injury.
• For installation purposes, be sure to use the parts supplied by the manufacturer or
other prescribed parts. The use of non-prescribed parts can cause serious accidents
such as the unit falling, water leakage, electric shock, or
fi
re.
• Do not turn on the power until all work has been completed.
CAUTION
This manual describes how to install the indoor unit only. To install the outdoor unit or
branch box, (if any), refer to the installation manual included in each product.
2. 2. Accessories
WARNING
• For installation purposes, be sure to use the parts supplied by the manufacturer or
other prescribed parts.
• The use of non-prescribed parts can cause serious accidents such as the unit falling,
water leakage, electric shock, or
fi
re.
• The following installation parts are furnished. Use them as required.
• Keep the installation manual in a safe place and do not discard any other accessories
until the installation work has been completed.
Name and Shape
Q’ty
Description
Installation manual
1
(This book)
Operating manual
1
–
CD-ROM
1
–
Template
(Carton top)
1
For installing indoor unit
Washer
8
For installing indoor unit
Coupler heat insulation (Large)
1
For indoor side pipe joint (Gas pipe)
Coupler heat insulation (Small)
1
For indoor side pipe joint
(Liquid pipe)
Insulation
1
For installing drain pipe
Drain hose
1
For installing drain pipe
VP25 (O.D.32, I.D.25)
Hose Band
1
For installing drain hose
Drain hose heat insulation
1
For installing drain pipe
Cable tie (Large)
4
For connection pipe
fi
xing.
Cable tie (Small)
2
Only one is used for this model.
2. 3. Pipe requirement
CAUTION
Refer to the installation manual of the outdoor unit for description of the length of con-
necting pipe or for difference of its elevation.
Model
Diameter [mm (in)]
Gas pipe
Liquid pipe
18/22/24
12.70 (1/2)
6.35 (1/4)
30/36/45/54
15.88 (5/8)
9.52 (3/8)
• Use pipe with water-resistant heat insulation.
CAUTION
Install heat insulation around both the gas and liquid pipes. Failure to do so may cause
water leaks.
Use heat insulation with heat resistance above 120 °C. (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is
expected to exceed 70 %, install heat insulation around the refrigerant piping.
If the expected humidity level is 70-80 %, use heat insulation that is 15 mm or thicker
and if the expected humidity exceeds 80 %, use heat insulation that is 20 mm or thicker.
If heat insulation is used that is not as thick as speci
fi
ed, condensation may form on the
surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less (at 20 °C).
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